郴州地热田地热温标的选取和热储温度估算

Selection of geothermometer and estimation of reservoir temperature in Chenzhou geothermal field

地热温标通常被用来评价地下热储温度,但在实际中,各种地热温标法计算出的热储温度相差很大,需要进一步判断矿物-流体的平衡状态。本文以郴州地热田为例,讨论地热温标的应用条件,通过Na-K-Mg三角图解法对地热系统中矿物-流体化学平衡作出定性判断,选取SiO2地热温标法估算郴州地热田的热储温度。该地热田中许家洞地热块段和下湄桥地热块段深部热储温度分别为81.36~85.39℃和64.71~64.78℃,计算结果可靠性高。

The geothermometer is usually used to evaluate the underground reservoir temperature. However, in real situation, the reservoir temperature of the geothermal field calculated by various geothermometers varies a lot, which requires further judgement of the fluid-rock equilibrium state. This paper discussed the application conditions of the geothermometer with the Luzhou geothermal field as an example. The Na-K-Mg triangular diagram was used to make a qualitative judgment of the fluid-rock equilibrium in the geothermal system and the SiO2 geothermometer was selected to estimate the reservoir temperature in the Chenzhou geothermal field. The reservoir temperatures of the Xujiadong geothermal block and Xiameiqiao geothermal block in this geothermal field are 81.36~85.39 ℃ and 64.71~64.78 ℃ respectively, which are highly reliable.